If I remember correctly from my highschool environmental science class you need for healthy soil and thus healthy plants the following:<br>(items that are listed first are needed the most)<br>MACRO NUTRIENTS<br>nitrogen<br>phosphorous<br>potassium<br>sulphur<br>calcium<br>magnesium<br>MICRO NUTRIENTS<br>iron<br>boron<br>zinc<p>Dylan<br>